| 摘要 |
Blood is pumped by a pump (24), preferably a biconcave diaphragm pump. When the blood pump is full of blood, this full condition is detected and a batch of blood is emptied completely from the pump for delivery to the patient. A second pump (68), also preferably a bi-concave diaphragm pump, pumps anticoagulant into the blood as it is recovered. This second pump ejects its contents every time the blood pump ejects its contents. Particulates in the blood are removed by a filter (20) and air is removed by a defoamer (12). Fluid and very small matter in the blood may be removed in a tangential flow separator (36). Blood flows through a narrow passage (50) along one or more membranes (38,40), with fluid and small matter passing through the membrane(s). A washing fluid (60) may be added to blood within this separator. A third pump (62), again preferably a bi-concave diaphragm pump, is used to add this washing fluid. The third pump is emptied whenever the blood pump empties, and thereafter refills with washing fluid. |
